정체모 is not a word 정체 모를 is a contracted form of "정체를 모를" 정체(正體) means "identity" 原形。真面目。 정체를 모르다 means "the identity is unknown" 정체 모를 means "which/whose identity is unknown ; unidentified" = 정체불명 = 身份不明 정체 모를 압박 means "a pressure which identity is unknown; unidentified pressure"